[BLDG-SIM] Performance Metrics
Marcus Sheffer
sheffer at paonline.com
Fri Jun 8 06:08:32 PDT 2001
Going by the Energy Cost Budget Method of compliance in 90.1 there are
relatively few parameters which can be changed. However, the rules are
somewhat different for a LEED comparison. 90.1 does not allow a comparison
between radically different HVAC systems for example, a LEED comparison
does. Check out the pertinent sections in the LEED Reference Guide for a
complete discussion of what is and is not allowed in a LEED comparison, it
is different than a strict 90.1 comparison. This would account for the
difference in the 35% going by 90.1 and the higher values in LEED. We just
submitted a project that exceeded 90.1 by 55% using the LEED allowed
methods of comparison.
At 06:45 PM 6/5/2001 -0600, you wrote:
>We have been involved locally with trying to use ASHRAE 90.1, both 1989
>and 1999 as a metric in new building design - i.e., `xx% better than code
>minimum' for both LEED compliance and for a State buildings program. I
>know there are a number of similar programs and initiatives throughout the
>country. I am also slated to give a presentation on "Issues Around Using
>ASHRAE 90.1-1999 as a Metric" at the ASHRAE Annual meeting in June
>(Seminar 28).
>I'm looking for two things - first what experiences have people had with
>`exceeding' the code by x%? I've heard rumors that a reputable simulation
>firm said 35% can't be done if you strictly interpret the code. LEED
>provides credit for 40% and 50% improvements. We've been using a
>completely arbitrary target of 35%, which with a little c o d
>e stretching seems to be obtainable. What is realistic based on your
>experience?
>Second, I would like to get some feedback on the whole `using 90.1 as a
>metric` issue that I might include in my presentation to round it out a
>little.
>Any feedback would be appreciated and of course I would credit anything I
>used in the Seminar.
>
>Mark E. Case, P.E.
>etc Group, Inc.
====================================================
Marcus B. Sheffer energy & environmental consulting
Energy Opportunities 717-292-2636
1200 E Camping Area Road Fax: 717-292-0585
Wellsville, PA USA 17365-9783 sheffer at sevengroup.com
a Seven Group member company www.sevengroup.com
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